First observation of the doubly charmed baryon Xi(+)(cc)

M Mattson; G Alkhazov; A G Atamantchouk; M Y Balatz; N F Bondar; P S Cooper; L J Dauwe; G V Davidenko; U Dersch; A G Dolgolenko; G B Dzyubenko; R Edelstein; L Emediato; A M F Endler; J Engelfried; I Eschrich; C O Escobar; A V Evdokimov; I S Filimonov; F G Garcia; M Gaspero; I Giller; V L Golovtsov; P Gouffon; E Gülmez; He Kangling; M Iori; S Y Jun; M Kaya; J Kilmer; V T Kim; L M Kochenda; I Konorov; A P Kozhevnikov; A G Krivshich; H Krüger; M A Kubantsev; V P Kubarovsky; A I Kulyavtsev; N P Kuropatkin; V F Kurshetsov; A Kushnirenko; S Kwan; J Lach; A Lamberto; L G Landsberg; I Larin; E M Leikin; Li Yunshan; M Luksys; T Lungov; V P Maleev; D Mao; Mao Chensheng; Mao Zhenlin; P Mathew; V Matveev; E McCliment; M A Moinester; V V Molchanov; A Morelos; K D Nelson; A V Nemitkin; P V Neoustroev; C Newsom; A P Nilov; S B Nurushev; A Ocherashvili; E Oliveira; Y Onel; E Ozel; S Ozkorucuklu; A Penzo; S V Petrenko; P Pogodin; M Procario; V A Prutskoi; E Ramberg; G F Rappazzo; B V Razmyslovich; V I Rud; J Russ; P Schiavon; J Simon; A I Sitnikov; D Skow; V J Smith; M Srivastava; V Steiner; V Stepanov; L Stutte; M Svoiski; N K Terentyev; G P Thomas; L N Uvarov; A N Vasiliev; D V Vavilov; V S Verebryusov; V A Victorov; V E Vishnyakov; A A Vorobyov; K Vorwalter; J You; Zhao Wenheng; Zheng Shuchen; R Zukanovich-Funchal

doi:10.1103/PhysRevLett.89.112001

First observation of the doubly charmed baryon Xi(+)(cc)

Phys Rev Lett. 2002 Sep 9;89(11):112001. doi: 10.1103/PhysRevLett.89.112001. Epub 2002 Aug 20.

Authors

M Mattson¹, G Alkhazov, A G Atamantchouk, M Y Balatz, N F Bondar, P S Cooper, L J Dauwe, G V Davidenko, U Dersch, A G Dolgolenko, G B Dzyubenko, R Edelstein, L Emediato, A M F Endler, J Engelfried, I Eschrich, C O Escobar, A V Evdokimov, I S Filimonov, F G Garcia, M Gaspero, I Giller, V L Golovtsov, P Gouffon, E Gülmez, He Kangling, M Iori, S Y Jun, M Kaya, J Kilmer, V T Kim, L M Kochenda, I Konorov, A P Kozhevnikov, A G Krivshich, H Krüger, M A Kubantsev, V P Kubarovsky, A I Kulyavtsev, N P Kuropatkin, V F Kurshetsov, A Kushnirenko, S Kwan, J Lach, A Lamberto, L G Landsberg, I Larin, E M Leikin, Li Yunshan, M Luksys, T Lungov, V P Maleev, D Mao, Mao Chensheng, Mao Zhenlin, P Mathew, V Matveev, E McCliment, M A Moinester, V V Molchanov, A Morelos, K D Nelson, A V Nemitkin, P V Neoustroev, C Newsom, A P Nilov, S B Nurushev, A Ocherashvili, E Oliveira, Y Onel, E Ozel, S Ozkorucuklu, A Penzo, S V Petrenko, P Pogodin, M Procario, V A Prutskoi, E Ramberg, G F Rappazzo, B V Razmyslovich, V I Rud, J Russ, P Schiavon, J Simon, A I Sitnikov, D Skow, V J Smith, M Srivastava, V Steiner, V Stepanov, L Stutte, M Svoiski, N K Terentyev, G P Thomas, L N Uvarov, A N Vasiliev, D V Vavilov, V S Verebryusov, V A Victorov, V E Vishnyakov, A A Vorobyov, K Vorwalter, J You, Zhao Wenheng, Zheng Shuchen, R Zukanovich-Funchal

Affiliation

¹ Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213, USA.

PMID: 12225136
DOI: 10.1103/PhysRevLett.89.112001

Abstract

We observe a signal for the doubly charmed baryon Xi(+)(cc) in the charged decay mode Xi(+)(cc)-->Lambda(+)(c)K-pi(+) in data from SELEX, the charm hadroproduction experiment at Fermilab. We observe an excess of 15.9 events over an expected background of 6.1+/-0.5 events, a statistical significance of 6.3sigma. The observed mass of this state is 3519+/-1 MeV/c(2). The Gaussian mass width of this state is 3 MeV/c(2), consistent with resolution; its lifetime is less than 33 fs at 90% confidence.